August 2019 Chemistry Regents Questions 1-10 Question Preview (ID: 59712)


Use Your Knowledge Of Chemistry To Answer All Questions In The Data Set. You Will Need Your Chemistry Reference Tables And A Calculator To Answer Some Of The Questions. Good Luck. TEACHERS: click here for quick copy question ID numbers.

Which statement describes the earliest model of the atom?
a) An atom is an indivisible hard sphere.
b) An atom has a small, dense nucleus.
c) Electrons are negative particles in an atom.
d) Electrons in an atom have wave-like properties.

In all atoms of bismuth, the number of electrons must equal the
a) number of protons
b) number of neutrons
c) sum of the number of neutrons and protons
d) difference between the number of neutrons and protons

Which symbol represents a particle that has a mass approximately equal to the mass of a neutron?
a) α
b) B+
c) B-
d) p

An orbital is a region in an atom where there is a high probability of finding
a) an alpha particle
b) an electron
c) a neutron
d) a positron

Which electron shell in an atom of calcium in the ground state has an electron with the greatest amount of energy?
a) 1
b) 2
c) 3
d) 4

As the elements in Period 2 are considered in order from lithium to fluorine, there is an increase in the
a) atomic radius
b) electronegativity
c) number of electron shells
d) number of electrons in the first shell

Which element is classified as a metalloid?
a) boron
b) potassium
c) sulfur
d) xenon

Strontium and barium have similar chemical properties because atoms of these elements have the same number of
a) protons
b) neutrons
c) electron shells
d) valence electrons

Which term represents the fixed proportion of elements in a compound?
a) atomic mass
b) molar mass
c) chemical formula
d) density formula

Which two terms represent types of chemical formulas?
a) mechanical and structural
b) mechanical and thermal
c) molecular and structural
d) molecular and thermal

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